Depends on the quantity and location.. If it's in city limits and you're doing the 30mph or less like you should be, it would take a lot of clippings and an idiot rider to have an accident because of it.. Sure, if you goose the throttle there won't be quite as much traction and you'll probably low-side, but then you deserve the darwin award.. That said, if people blow ALL their lawn clippings onto the road because they're too damn lazy to dispose of them, then they ought to get a ticket too, if only for littering.